The only reasonable explanation for the change would be Apple has managed to get battery optimisation through software to ensure the downgrade is a non-issue, although this hasn't stopped people from voicing their concerns.

Aside from the smaller battery, the newer models do have a number of improvements.

Both the iPhone 8 and 8 Plus now have aluminium banding around the edge, with the strongest glass ever on a smartphone on the front and back of the device.

Photography has also been made easier with an Apple-designed image signal processor, which allows for faster lowlight auto focus, improved pixel processing and noise reduction.

An all new 12-megapixel sensor with 83 per cent more light and an improved portrait mode.

The 8 Plus has stuck with dual 12MP sensors and will include a dual-camera feature called "Portrait Lighting", which allows users to rework the lighting while composing the shot to add a sense of depth.

In terms of video, the iPhone 8 and iPhone 8 Plus can shoot 4K 60 frames per second and 1080p 240 frames per second in slow-mo. The iPhone is calibrated for augmented reality photos, apps and games.

As expected, the iPhone 8 and iPhone 8 Plus have been made for wireless charging and will use the Qi system used by restaurants, shops, cars and airports.

The iPhone 8 and 8 Plus will be available in 64GB and 256GB. The iPhone 8 will start from $A1079, while the iPhone 8 Plus will start from $A1229. Both devices are now available for pre-order and will be in stores beginning September 22.

Three new iPhones:
What's the difference in the three new phones from Apple?